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Acadia National Park Managers’ Report
A citizen science early-detection summary
Welcome to the weekly early detection report of observations submitted by iNaturalist and eBird users. These are all observations submitted over the past week for species that Acadia National Park managers and partners have identified as being of conservation interest. These data for this report comes from two of the largest open source citizen science projects: iNaturalist and eBird. The records included in this report include both casual and research grade observations, so erroneous identifications are possible. Users should double check the identification of species to ensure they are correct.
23 October 2025 - 29 October 2025

Explore Species Locations

Invasive Species

A Hemlock tree infested with Hemlock Woolly Adelgid
© Jesse Wheeler
Scientific Name Common Name Date Observed Link
Litylenchus crenatae beech leaf disease 2025-10-24 view observation
Cirsium vulgare bull thistle 2025-10-23 view observation
Cirsium vulgare bull thistle 2025-10-23 view observation
Tussilago farfara colt’s-foot 2025-10-28 view observation
Verbascum thapsus great mullein 2025-10-23 view observation
Rosa rugosa rugosa rose 2025-10-23 view observation

Threatened & Endangered Species

Two Red Knots in flight
© Fyn Kynd
Scientific Name Common Name Listing Date Observed Link
Histrionicus histrionicus harlequin duck state threatened 2025-10-29 view observation
Falco peregrinus peregrine falcon state endangered 2025-10-26 view observation
Alca torda razorbill state threatened 2025-10-26 view observation
Alca torda razorbill state threatened 2025-10-29 view observation

Rare Species

A flowering Nodding Trillium
© Andy Fyon
Scientific Name Common Name Date Observed Link
Solidago flexicaulis broad-leaved goldenrod 2025-10-23 view observation
Corema conradii broom crowberry 2025-10-23 view observation
Tsuga canadensis eastern hemlock 2025-10-23 view observation
Tsuga canadensis eastern hemlock 2025-10-28 view observation
Pinus resinosa red pine 2025-10-23 view observation
Capnoides sempervirens rock harlequin 2025-10-29 view observation
Woodsia ilvensis rusty woodsia 2025-10-23 view observation
Epigaea repens trailing arbutus 2025-10-23 view observation
Epigaea repens trailing arbutus 2025-10-23 view observation
Cicuta maculata water hemlock 2025-10-26 view observation

Buffer Zone Species (10-mile buffer)

© Kyle Lima
Scientific Name Common Name Date Observed Link
Frangula alnus alder buckthorn 2025-10-29 view observation
Litylenchus crenatae beech leaf disease 2025-10-24 view observation
Cirsium vulgare bull thistle 2025-10-23 view observation
Cirsium vulgare bull thistle 2025-10-23 view observation
Cirsium vulgare bull thistle 2025-10-28 view observation
Tussilago farfara colt’s-foot 2025-10-28 view observation
Verbascum thapsus great mullein 2025-10-23 view observation
Celastrus orbiculatus oriental bittersweet 2025-10-25 view observation
Rosa rugosa rugosa rose 2025-10-23 view observation

New Park Species

A something
© Kyle Lima

There were no new species to the park reported this week.

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